Thursday, 6 January 2011

Impact Crater in New Mexico – Part 2 Lincoln County Revisited

Impact Crater in New Mexico – Part 2 Lincoln County Revisited

In Impact Crater in New Mexico – Part 2 Lincoln County athttp://six.pairlist.net/pipermail/meteorite-list/2011-January/072230.htmlRob, about the features in 34° 0' 51.00" N 105° 8' 41.46" W( 34.0142° N, 105.1448° W ) commented,“Looking at these features in Google Earth, they appearto be capped limestone structures rather than depressions.Has anyone on the discussion list actually been there?”I consulted the USGS topographic map and the 10-m DEMfor the Cowboy Mesa SW 7.5 minute quadrangle. Theyboth show that these features are depressions and thatthey are certainly not limestone capped hills. Dependingon how a person’s brain interprets the shadows, imageson two-dimensional aerial photographs can appear to beeither depressions or hills. Because of this quirk of howthe brain works, it is useful to consult either topographicmaps, digital elevations models (DEMs), or stereo pairsof aerial images when making interpretations.Similar depressions can be seen elsewhere in theregions in aerial photos and topographic maps.Similar depressions occur in Sections 29 and 28 ofT. 4S., R. 17E. at 33.936° N, 105.179° W. This isabout 9 km south-westsouth of Guenther’s depressions.Even more depressions can be seen about 32 km tothe west – west-southwest in Sections 1, 2, 12, 20,21, 22, 33, 34, and others of T. 4S., R. 14E. Examplesof other similar depression can be found at 33.988° N,105.435° W. and 33.946° N, 105.479 W. They all havethe typical morphology of sinkholes. The typicalmorphology of sinkholes as seen in topographic mapsis discussed by Miller and Westerback (1989).By the way the correct location for Guenther’s depressionsis S1/2 of the SE1/4, of Section 27 and the N1/2 of theNE 1/4 of Section 34 of T. 3S., R. 17E. I mistakenly wrote“NE 1/2” instead of NE1/4”.These posts are in reference to “Impact Crater in New Mexico” athttp://six.pairlist.net/pipermail/meteorite-list/2011-January/072191.html

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